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as level chemistry; alkanes and alkenes helpp!!! Watch

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    hi guys, im really stuck and dumb at chemistry :/
    can you please help me on this question:

    bromine reacts with both ethane and ethene
    i) write the equation for the reactions below
    ethane + bromine
    ethene + bromine

    ii) classify the 2 reactions in terms of the type of reaction occuring
    ethane + bromine
    ethene + bromine


    thanks guys
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    (Original post by Anonymous 16)
    hi guys, im really stuck and dumb at chemistry :/
    can you please help me on this question:

    bromine reacts with both ethane and ethene
    i) write the equation for the reactions below
    ethane + bromine
    ethene + bromine

    ii) classify the 2 reactions in terms of the type of reaction occuring
    ethane + bromine
    ethene + bromine


    thanks guys
    Whats the chemcial formula for ethane and Bromine, and then balance. Similarly whats the chemcial formula for Ethene and then balance. Are they exo endo etc
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    (Original post by hazbaz)
    Whats the chemcial formula for ethane and Bromine, and then balance. Similarly whats the chemcial formula for Ethene and then balance. Are they exo endo etc
    ethane is C2H6 and bromine is Br2
    ethene is C2H4 and bromine is Br2
    what next?
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    (Original post by Anonymous 16)
    ethane is C2H6 and bromine is Br2
    ethene is C2H4 and bromine is Br2
    what next?
    ethane one: C2H6 + Br2 --> 2CBr + 3H2
    ethene one: C2H4 + Br2 --> 2CBr + 2H2

    I'm probz wrong though... i really hate chemistry this year :-/

    Btw, have you done polarisation?! I literally can't understand it
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    (Original post by Anonymous 16)
    hi guys, im really stuck and dumb at chemistry :/
    can you please help me on this question:

    [COLOR="black"][COLOR="black"][COLOR="black"][COLOR="black"]bromine reacts with both ethane and ethene
    i) write the equation for the reactions below
    ethane + bromine
    ethene + bromine

    ii) classify the 2 reactions in terms of the type of reaction occuring
    ethane + bromine
    ethene + bromine[/COLOR]
    [/COLOR][/COLOR][/COLOR]

    thanks guys
    Bromine water is the test for alkenes. The bromine will add across the double bond to give a disubstituted haloalkane.
    Reaction with Ethene: C2H4 + Br2 = C2H4Br2
    Reaction with Ethane: No reaction

    (Original post by sweetascandy)
    ethane one: C2H6 + Br2 --> 2CBr + 3H2
    ethene one: C2H4 + Br2 --> 2CBr + 2H2

    I'm probz wrong though... i really hate chemistry this year :-/

    Btw, have you done polarisation?! I literally can't understand it
    That is wrong. See my answer above
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    ethane
    C2H6 + Br2 --> C2H4 + 2HBr
    that's the overall one for the first halogenation of ethane... if you want the step by step mechanism that's different
    ethene
    C2H4 + Br2 --> C2H4Br2

    ethane one is a free radical substitution
    ethene one is an electrophilic addition reaction
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    (Original post by Seham)
    Bromine water is the test for alkenes. The bromine will add across the double bond to give a disubstituted haloalkane.
    Reaction with Ethene: C2H4 + Br2 = C2H4Br2
    Reaction with Ethane: No reaction



    That is wrong. See my answer above
    At least I attempted to do it... you have to give me credit for that :p:
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    (Original post by Seham)
    Bromine water is the test for alkenes. The bromine will add across the double bond to give a disubstituted haloalkane.
    Reaction with Ethene: C2H4 + Br2 = C2H4Br2
    Reaction with Ethane: No reaction
    ethane will react with bromine provided there is UV light
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    (Original post by Seham)
    Bromine water is the test for alkenes. The bromine will add across the double bond to give a disubstituted haloalkane.
    Reaction with Ethene: C2H4 + Br2 = C2H4Br2
    Reaction with Ethane: No reaction



    That is wrong. See my answer above
    thank you soo much
    how do you do part ii)?
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    (Original post by sweetascandy)
    At least I attempted to do it... you have to give me credit for that :p:
    Ok

    (Original post by chemkid)
    ethane will react with bromine provided there is UV light
    That was not specified, but you are correct. If UV light is provided, the product of the reaction of ethane with bromine is:
    HBr + C2H5Br
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    (Original post by sweetascandy)
    ethane one: C2H6 + Br2 --> 2CBr + 3H2
    ethene one: C2H4 + Br2 --> 2CBr + 2H2

    I'm probz wrong though... i really hate chemistry this year :-/

    Btw, have you done polarisation?! I literally can't understand it
    Okay I'm gonna help you in a nutshell!

    A polar bond is when two atoms with different levels of electronegativity join, and the covalent electons and more attracted to the more negative atom. An example is B-Cl.

    Intermolecular.

    Dipole-Dipole is basically the same thing. Remember this!

    Van Der Waals should be easy.

    Hydrogen Bonding is when H atoms bond with N, O or F atoms. ONLY THESE ONES! There must always also be a lone pair present.

    P.s Please rate me if you found this helpful
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    (Original post by Anonymous 16)
    thank you soo much
    how do you do part ii)?
    Well you need to think about the products being formed.
    The ethane one is a free-radical substitution as you are substituting one H for a Br in the ethane.
    The ethene one is an electrophilic addition reaction as you are adding a molecule across a double bond.
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    (Original post by chemkid)
    ethane
    C2H6 + Br2 --> C2H4 + 2HBr
    that's the overall one for the first halogenation of ethane... if you want the step by step mechanism that's different
    ethene
    C2H4 + Br2 --> C2H4Br2

    ethane one is a free radical substitution
    ethene one is an electrophilic addition reaction
    The ethane reaction products are incorrect. You do not form ethene. You form C2H5Br + HBr.
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    (Original post by shahedul)
    Okay I'm gonna help you in a nutshell!

    A polar bond is when two atoms with different levels of electronegativity join, and the covalent electons and more attracted to the more negative atom. An example is B-Cl.

    Intermolecular.

    Dipole-Dipole is basically the same thing. Remember this!

    Van Der Waals should be easy.

    Hydrogen Bonding is when H atoms bond with N, O or F atoms. ONLY THESE ONES! There must always also be a lone pair present.

    P.s Please rate me if you found this helpful
    Hmm well we havent really covered all of that yet.. we've just had an introductory lesson to it. Now I think I understand it a bit more, having had another lesson on it today. But thanks anyway!

    P.S. I'll +rep you anyway for the sake of it :P
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    (Original post by Anonymous 16)
    hi guys, im really stuck and dumb at chemistry :/
    can you please help me on this question:

    bromine reacts with both ethane and ethene
    i) write the equation for the reactions below
    ethane + bromine
    ethene + bromine

    ii) classify the 2 reactions in terms of the type of reaction occuring
    ethane + bromine
    ethene + bromine


    thanks guys
    This WILL get easier Once you see more and more reactions of this type, you'll get to know how they work and be able to apply them...if that sounds like the impossible now, you are wrong, just practice

    Sorry that wasnt answering the question, it's just because im just starting to actually learn my A2 organic/analysis module (OCR A) and what ive said holds true

    Also past papers ftw

    Good luck!
 
 
 
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